The calculated distance (air line) between Ciudad Nezahualcoyotl and Tlalpan is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Tlalpan is certainly longer, as only the direct route (as the crow flies) between Ciudad Nezahualcoyotl and Tlalpan has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles